Core/Misc: fix interaction of spells like Shadowmeld with Threat reducing effects

- SPELL_AURA_MOD_TOTAL_THREAT should be temporary and not added/subtracted from total, only computed
- Cleanup of reference related code
- Kill getLast() and reverse iterator obsevers, LinkedList iterator can't be used as a standard reverse_iterator (ie with operator++). They weren't used anyways

(cherry picked from commit 3b6fd226bedb689847dadaeeba36a588ee9bc928)

# Conflicts:
#	src/server/game/Combat/ThreatManager.cpp
#	src/server/game/Loot/LootMgr.h

1 files changed, 2 insertions, 2 deletions

diff --git a/src/server/game/Loot/LootMgr.h b/src/server/game/Loot/LootMgr.h
index d3356d4a629..2982025cd72 100644
--- a/src/server/game/Loot/LootMgr.h
+++ b/src/server/game/Loot/LootMgr.h
@@ -131,8 +131,8 @@ class TC_GAME_API LootTemplate
         LootGroups        Groups;                           // groups have own (optimised) processing, grouped entries go there
 
         // Objects of this class must never be copied, we are storing pointers in container
-        LootTemplate(LootTemplate const&);
-        LootTemplate& operator=(LootTemplate const&);
+        LootTemplate(LootTemplate const&) = delete;
+        LootTemplate& operator=(LootTemplate const&) = delete;
 };
 
 //=====================================================